BIOLOGY 2A03 Chapter 4: Chapter 4 Membrane Transport
19 Jan 2016
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Document Summary
Key to intracellular homeostasis, membrane transport is one of the primary. Properties and composition (lipids, transport proteins, etc. ) of the cell membrane are key to maintaining cellular homeostasis: 25-50% of resting metabolic rate is used to pump stuff across membranes actively with atp. Membranes: very important as selective barriers, transport proteins dictate movement in and out of cells ore organelles, membrane proteins can also be involved in detecting chemical messengers at the cell surface. Transport across membranes is very important for maintaining intracellular and extracellular homeostasis. Table just shows that solutes in icf and ecf are very different. Transport processes include: passive transport, mechanisms that do not require atp. Carrier-mediated diffusion through transmembrane protein channel: active transport, mechanisms that do require atp and dedicated transport proteins. Diffusion: movement of molecules from one location to another due to random thermal motion.
